He has not a single attribute I associate with a good midfielder (apart from running around I guess). France (and Atletico) are his absolute comfort zones, working hard in a deep block and having a few quality touches here and there (for example before the offside goal vs Germany). He's not a complete talentless hack, but badly limited to a specific role (and we can't offer him that role, and it's not because Messi occupies it). We will rightfully never want one of our forwards to only contribute to counter attacks by good touches in midfield (and nothing else).
If we don't have a clear plan how to start him he should be gone. There's minimal hope for something like Fati/Depay - Messi/Aguero - Griezmann to work out.